lightning
since nobody has said anything, you need a heavy solid copper, see house grounding kits, a direct route with no sharp bends from the mast or tabernacle to the keel bolt or ground plate with oversized connectors at each end, if they burn off they don't work. you can also attach a length of anchor chain to a stay with a cable clamp(kind with nuts) and drag over the side in an emergency. chain should be 3 feet or more into the water.
